Decorated glass objects and method of protecting the decorated surfaces



25 1927. Oct K. WARGA DECORATED GLASS OBJECTS AND METHOD OF PROTECTING THE DECORATED suRFAcEs Filed Aprll 2, 1924 I INVENTOR.v

BY F ,l /LflA/ ATTO EYS. A QQ Patented Oct. 25, 1927.,

v K i J RALMAN WARGA, or NRW YORK, N. Y., Ass1c NoR To rYRocoLOR CORPORATION, OF

- I NRW YORK, Nez., A CORPORATION or VIRGINIA.

DECORATIE!) GLASS OBJECTS AND METHOD OF PROTECTING THE DECQRATED S'URFAI'JIES.A

Application led April 2,

The decorated surfaces of glass objects are subjected,to atmospheric, acid and mechanical erosion, especially when mounted 1n exposed situations, which quickly destroy 5 the appearance and function of the decoration whether it be letters, symbols or fanciful designs. So serious are the effects named, that it has become the best practice to lead in colored decorative sections. This solution is expensive and lacks some of the advantages to be derived from the use of an 1ntegral glass object having the decorations applied to its surface. The prmclpal oloject of the present invent1on 1s to provide a method of decorating glass surfaces 1n distinctive color and then applying a protective coat-ing to such surface which is atmosphericand acid-proof and protects the color from injury through physical causes. Still` V another object is to provide a simple and inexpensive method of decorating the surface of clear glass sheets with color which is fixed thereon and then applying a protective coating over the color which makes the glass object translucent without changing the true hue of the color when viewed with a light background, and yet insuring the most vivid display possible for a light source of given candlepower. Still another object of the invention is to provide a process for ldecorating a glass surface and protecting the decoration at the time the glass is heated to a temperature necessary for working into desired form, such as spherical or curved.

In practicing the invention'one or more colors may be employed in decorating a glass surface and the colors may be applied in accordance with the process set forth in Letters Patent'v of thefUnited States No. 1,283,606 dated November 5, 1918, or merely stencilled on the surface. Next it is proposed, in accordance with the invention, to apply over the colors and, usually, overthe entire surrounding surface of the glass a White enamel which has a lower fusing point than the. glass. This enamel is of 'such properties as to render crystal glass translucent and protect the color against atmospheric, acid and physical attacks. M Ore specifically, the preferred method consists inapplying 011e or more colors to a glass surface, in accordance with the process described in said Patent No. 1,283,606, treating the surface with a protective enamel and V then shaping the glass, all of these steps belthe fusing point of the enamel is fixed lower 1924. serian No. 703,827.v

than that of the glass so that the color is first tired' without disturbing the enamel and the glassis worked without danger.

The invention will be described in greater detail in connection with the drawing which shows, merely by way of illustration, a crystal glass globe whose rear surface has been treated in accordance with the process and in which: l Figure 1 is a view in elevation of the globe. Figure 2 is a fragmentary sectional view through the lettering thereon and taken on the planeindicated by the line 2--2of F igure 1 and looking in the direction of the arrows.l

While the invention is not to be limited in its broader aspect, to the use of crystal glass nor to the manner in which the decoration is applied to the surface, the preferred 80 embodiment contemplates the use of ordinary clear glass and the firing of color thereon. In carrying out the process a flat sheet of clear glass a may have applied to its surface suitable colored lettering, symbols or fanciful decorations by either stenciling or by the method described in Letters Patent of the United States No. 1,283;

606. In this method the design for the colory is printed upon' the gummed 'face of the decalcomania paper and is dusted with the desired color. Powdered iux is mixed with the color in such proportions as to fix the fusing temperature at the desired point. The dccalcomania paper bearing the color 9J design is then applied to the surface of the glass sheet a which has been treated with/a size and the paper removed leaving the design transferred, as indicated at b. Any

gum from the decalcomania'paper mayv be 100' such that it is within the Working range of the glass.

Following the treatment described the glass is then heated to the irlng point of the color so that it is fixed on the glass in the manner pointed out in said Patent No. 1,283,606. A continuance of heatbrlngs the glass to a temperature where 1t may be Worked into any desired cross sectional form. In the illustrated embodiment it is proposed to shape it into an integral sphere -to serve as a globe for use overan electr1c lamp. After having given the glass' plate the desired form the temperature is gradually reduced to atmospheric.

The resulting object is onc'in which Ithe, crysta'l glass is rendered translucent by the enamel backing c but this backing 1s of such nature as to insure the most vivid light effect for a given candle-power. The color of the decoration b is protected by the coating from atmospheric, acid and physical disintegration and has been found in practice to give its true hue when viewed with a light source back of it. The process yis economical, saving the repeated heating and treating of the glass in different stages rather than in completing all of the operations described at a single heating. l

A s pointed out before, the design might be applied by stencillng on the rear surface of the glass and the enamel coating then applied and the same degree of protection secured.

What I claim is: i 1. The method ofdecorating glass objects' and rotecting the decoration which consists 1n printing the color design on the surface by 'decalcomania transfer, applying a coating of weather and acid-proof enamel to a temperature sufficient to lfire the color,`

the material of the color and of the enamel having been previously so compounded as to fuse at a temperature below the fusing point of the glass, and then shaping the glass during such heating to the desired cross-sectional form.

This Ispecification signed this 28th day o March A. D. 1924.

KALMAN `WARGA. 

